A list of pattern used by the pattern type alert groups
which are currently configured in the device.
An entry is created if a configured alert group
whose callHomeAlertGroupCapability has 'regularExpression'.
An entry is deleted if the destination profile unsubscribes
a pattern based alert group.
Additional entry can also be created through
ccmPatternAlertGroupStatus.
Deleting all the entries for a destination profile alert
group combination will result in profile unsubscribing to
that alert group.